Varios Adjustment; How To Exchanging The Tension Spring Of The Needle Thread Tensioner Unit - Mitsubishi Electric PLK-J10050R Technical Manual

7. VARIOS ADJUSTMENT

(1) Please make sure to turn the power switch off before adjusting the sewing machine.
(2) When adjusting the sewing machine with the power switch on, please be careful not to step on the
foot switch by mistake.
(3) Please be careful not to be injured by a sharp part such as the needle and the hook point.
(4) Please make sure to put the safety guards (eye guards, link covers, and finger guards or the others)
back on the initial position after the sewing machine adjustment.

7-1. How to exchanging the tension spring of the needle thread tensioner unit

According to following procedures, exchange the tension spring (No.1). It is same way to exchanging the
optional stronger tension spring.
NOTICE It is required to use the factory original tension spring.
(1) Turn the thumb screw (No.2) and decrease the tension spring pressure.
(2) Loosen the set screw (No.4) and then remove the set screw (No.3) and remove the thumb screw
(No.2). The set screw (No.3) and (No.4) are same parts.
CAUTION
<1>
<2>
<4>
- 28 -
<1>: Tension spring
<2>: Thumb screw
<3>: Set screw
<4>: Set screw
<3>